GB/T 33791-2017 in English
SUPERSEDEDTechnical specification for cathodic protection of steel well casings
- Issued on:2017-05-31
- Implemented on:2017-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$272.00
《GB/T 33791-2017钢质井套管阴极保护耐蚀作业技术规范》由TC381（全国腐蚀控制标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
In-depth interpretation of GB/T 33791—2017 National Standard of the People's Republic of China
| Standard Dimensions | Content Overview | Key Analysis |
|---|---|---|
| Corrosion Assessment | Comprehensively assess the possibility of corrosion through environmental factors, historical records and test data. | Key steps include: - Corrosion history study - Environmental condition analysis (such as formation resistivity) - Casing potential measurement |
| Necessity of Cathodic Protection | Determine whether to implement cathodic protection by comprehensively considering economic and technical feasibility. | Evaluation factors: - Economic cost - Environmental impact - Technical feasibility |
| Design current demand | Protection current is determined by profile potential method, E-logI test and other methods. | Calculation methods include: - Profile potential method - Polarization curve method - Numerical simulation |
Explanation of professional terms and practical application
Casing potential profile:Used to measure the potential difference of casing at different depths to help determine the corrosion area and protection current distribution.
E-logI test:Evaluate the effectiveness of cathodic protection by applying an impressed current and measuring the potential change.
Comparative analysis of standard frameworks
| Standard dimensions | GB/T 33791—2017 | NACE RP0186 | BS EN 15112 |
|---|---|---|---|
| Scope of application | Cathode protection system for the outer surface of steel casing in oil and gas wells. | External corrosion control of oil well casing. | External cathodic protection of buried metal structures. |
| Core requirements | Ensure that there is no anode area on the casing surface, and the current density range is 10~200 mA/m². | Provide sufficient cathodic protection current to prevent external corrosion. | Consider soil resistivity and groundbed design to ensure uniform current distribution. |
Implementation Recommendations
1. Corrosion Assessment and Risk Analysis:
- Identify areas of high corrosion risk by combining historical data and environmental factors.
- Use casing potential profiles and E-logI tests for detailed assessment.
2. Cathodic Protection System Design:
- Select shallow or deep wellbeds based on formation resistivity.
- Rationally configure the number and spacing of anodes to reduce the impact of gas blockage.
3. System Installation and Maintenance:
- Ensure the continuity of electrical connections and the effectiveness of insulation devices.
- Regularly check the status of power supply equipment and anode filler.
4. Stray current control:
- Install drainage equipment to reduce the corrosion effect of stray current on bushing.
- Optimize the design of grounding system to avoid galvanic corrosion.
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